How to find the best place to set up the vanishing point axes in fSpy?
Fspy calculates the camera placement and field of view based on perspective, by tracing lines that would be straight and parallel in the real world, but in an image they converge towards a Vanishing Point.
So try to find the lines that give you the best sense of perspective and fspy will do the rest.
In this case the vertical lines of the building would work fine (most buildings are indeed vertical), and it gets a bit trickier on the street.
The lines you are using are setting in fspy seem too short, specially the vertical ones, extend the lines so that you trace most of the building.

Set the horizontal lines a bit further apart so that you get a better sense of the perspective.